How To Fix Roof Flashing Around Chimney

Hammer 2 roofing nails into the flashing and roof.

How to fix roof flashing around chimney.

Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner. Chimney roof leaks are usually caused by gaps or cracks between the metal flashing used to join the chimney to the roof and the chimney. Use a chisel to remove any hardened roofing cement. Use special masonry caulk to seal the joints between the flashing and the chimney.

Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. Clean any leaves or other debris out of the gap between the flashing and chimney. Leaks around fireplace chimneys are common and can be hard to identify the source. Bend a piece of cap flashing to fit around the top corner of the chimney and add the cap flashing across the back of the chimney.

Pound the flashing into the grooves and fasten with the drive in expanding anchors. Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right. Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Bend the corner flashing tightly around the corner.

Apply a generous amount of roofing cement behind the flashing. Applying roofing cement to gaps between metal flashing and the chimney. Step flashing on roof peak. To repair loose roof chimney flashing.

Place the step flashing over the caulk and onto the chimney. The only way to repair flashing is to replace it. Use masonry nails or screws to reattach the flashing tight. Place a small drop of caulk where the roof and chimney meet at the chimney corner.

Roof shingle over step flashing. Set the flashing aside. If you do not wish to form your own corner flashing you can buy pre bent pieces and cut them to size or use a piece of corrugated aluminum which is easier to bend. Before going up on the roof to do the replacement it is recommended that measurements are taken around the chimney so that the flashing can be ordered.

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